| Popis: |
The extractive membrane bioreactor (EMB) is a new technology for the treatment of wastewaters containing poorly water-soluble organic compounds. It consists of a bioreactor linked to membrane modules which contain bundles of silicone rubber tubes. Wastewater is pumped through the tube lumens and the biomedium is circulated around the shell side. This paper describes two simple mathematical models developed to compare EMB flow configurations and the results of experiments performed to test the models. We show that tube side Reynolds number has a significant effect on the mass-transfer coefficient of the test pollutant (monochlorobenzene) through the membrane. We also show that, on scale up, for a constant wastewater membrane residence time, an EMB consisting of three membrane modules with tube side recycle flows ≈40 times the wastewaster flow will have a higher extraction efficiency than an equivalent EMB with plug flow inside the module. |
Full Text from ScienceDirect